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2,277 Articles
8,741 Members
140 Directory Listings
153,603 Followers

The world's best gem articles, published weekly.

Most Recent Articles

Oval-Cut Diamond Buying Guide: Beyond the Bowtie

Don’t let the bowtie effect keep you from buying an oval-cut diamond. With prices lower than rounds, ovals are also a stylish choice for engagement rings.

How to Grade Fancy Cut Diamonds

Fancy cut diamonds can have any finished shape, except round. These stones have their own grading criteria, in particular regarding proportion and symmetry.

Recutting Diamonds and Colored Gemstones

When is recutting diamonds and other gems worthwhile for a professional gemologist? Learn how to make this determination and avoid potential problems.

Proustite Value, Price, and Jewelry Information

Proustite crystals have magnificent red colors and good brilliance. Although facetable, they’re too soft for jewelry use but highly desired as collector’s gems.

How to Grade Set Gemstones

Gems in jewelry settings can’t be evaluated the same way as loose stones. These guidelines are for gemologists learning to grade set gemstones.

Searching for Diamonds Online — Save With These Tips!

Searching for diamonds online shouldn’t be so complex. Use our recommended parameters to buy the best diamond for your engagement ring — and your wallet!

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

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Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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